Moving from South Dakota to Arizona: Residency, Taxes, and What to Prove

In South Dakota

South Dakota is a genuine, common tax-home domicile choice for travel nurses because it imposes no income tax and its driver's license rule (one overnight stay plus a mailing address) is achievable even for someone who is only in the state briefly between assignments. As with any tax-home claim, the IRS still requires the nurse to actually maintain and periodically return to a real home base, not just a mailing address, or the tax-free housing stipend can be reclassified as taxable wages; a South Dakota mail-forwarding address with no genuine pattern of returning to the state is a weaker tax-home claim than one paired with real, if infrequent, physical presence.

In Arizona

Arizona's Phoenix and Tucson hospital systems make it one of the largest travel nurse markets in the country. A nurse who is actually Arizona-domiciled and takes Arizona contracts is simply an Arizona resident under ordinary rules. A nurse who claims Arizona as a tax home while working travel assignments elsewhere needs a genuine, regularly used Arizona residence with duplicated living expenses, or the stipend portion of their pay risks being reclassified as taxable wages if audited.

In South Dakota

South Dakota has no major professional sports franchise. South Dakota itself never taxes any athlete's income regardless of domicile, but a South Dakota-domiciled athlete still owes nonresident jock tax in every state with an income tax where they play, based on duty-day apportionment; South Dakota's appeal as a domicile is that it eliminates the home-state slice of that calculation entirely.

In Arizona

Arizona is home to the Cardinals, Suns, Diamondbacks, and the Coyotes' successor tenant at Mullett Arena, and MLB's Cactus League spring training in March adds a significant block of extra duty days for every visiting team's roster. Arizona applies standard duty-day allocation to nonresident athlete income, but because the flat rate is only 2.5%, Arizona produces one of the lowest jock-tax burdens of any state that taxes athlete income at all.

In South Dakota

South Dakota is less commonly the destination for classic snowbird arrangements (that role is dominated by Florida, Arizona, and Texas) and more commonly the domicile-of-record for people who are mobile year-round, especially full-time RVers who don't have a fixed second home anywhere. Because South Dakota imposes no exit test of its own on people leaving and no entry test creating South Dakota tax liability, the entire audit risk in a South Dakota domicile arrangement sits with whatever state the person actually spends significant time in, most often assessed under that state's own statutory residency or day-count rules.

In Arizona

This is Arizona's signature scenario: the state's own nine-month (roughly 274-day) presumption explicitly allows spending a large chunk of the year in Arizona without automatically becoming a resident. Large numbers of California and Midwest retirees winter in the Phoenix and Tucson areas from October through April while keeping their prior-state domicile, but they need to track their total Arizona days against the 274-day threshold and remember their origin state runs its own, separate presumption pointing the other direction.

In South Dakota

There is no convenience-of-the-employer rule to worry about because South Dakota has no income tax to apply one under. A remote worker who establishes genuine South Dakota domicile, meaning an actual driver's license, mailing address, and a credible pattern of connection to the state, owes $0 South Dakota tax regardless of where their employer is headquartered, which has made South Dakota a popular domicile choice for remote workers leaving California, New York, and other high-tax states, alongside Texas and Florida.

In Arizona

Arizona has no convenience-of-employer rule. A nonresident who performs all their work physically outside Arizona for an Arizona-based employer is not Arizona-taxed on those wages. Arizona also has a narrow reciprocal withholding exemption (Form WEC) with California, Indiana, Oregon, and Virginia: residents of those four states working in Arizona can request their Arizona employer withhold no Arizona tax, though the arrangement runs one direction and doesn't create general two-way income tax reciprocity.

In South Dakota

South Dakota follows the federal Servicemembers Civil Relief Act and Military Spouses Residency Relief Act. Because South Dakota has no income tax, service members and spouses who elect South Dakota domicile under MSRRA simply owe no state tax on military pay or spousal income. Ellsworth Air Force Base near Rapid City is the state's major installation and a common source of South Dakota domicile elections among service members and their spouses.

In Arizona

Arizona follows the federal Servicemembers Civil Relief Act and Military Spouses Residency Relief Act. Nonresident military stationed in Arizona under orders don't become Arizona residents from the posting alone, and their military pay isn't Arizona-taxed if domiciled elsewhere. Arizona also fully exempts military retirement pay for its own domiciled veterans.

In South Dakota

Federal law (49 U.S.C. §40116) limits taxation of air carrier employees to their state of residence and any state where they earn more than 50% of pay. South Dakota is not a major airline crew base, but since South Dakota itself never taxes income, South Dakota-domiciled crew simply owe $0 South Dakota tax and rely on the federal rule to limit exposure to whichever state actually taxes them.

In Arizona

American Airlines operates a major hub and crew base at Phoenix Sky Harbor (PHX). Federal law (49 U.S.C. §40116) limits taxation of air carrier employees to their state of residence and any state where they earn more than 50% of pay, which matters directly for Arizona-based crew flying national routes.